Update type hints within ./tests #1038

Job	Run time
linters (3.9, ubuntu-latest)	1m 1s
Testing on Python 3.8 (ubuntu-latest)	50s
Testing on Python 3.8 (macos-13)	1m 58s
Testing on Python 3.8 (windows-2019)	2m 16s
Testing on Python 3.9 (ubuntu-latest)	50s
Testing on Python 3.9 (macos-13)	1m 54s
Testing on Python 3.9 (windows-2019)	3m 4s
Testing on Python 3.10 (ubuntu-latest)	54s
Testing on Python 3.10 (macos-13)	1m 31s
Testing on Python 3.10 (windows-2019)	2m 8s
Testing on Python 3.11 (ubuntu-latest)	55s
Testing on Python 3.11 (macos-13)	1m 30s
Testing on Python 3.11 (windows-2019)	2m 50s
Testing on Python 3.12 (ubuntu-latest)	59s
Testing on Python 3.12 (macos-13)	1m 45s
Testing on Python 3.12 (windows-2019)	4m 17s
	28m 42s

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